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Application of a unique monoclonal antibody as a marker for nonproliferating subpopulations of cells of some tissue

E Wang and JG Krueger

A monoclonal antibody (clone S-30), directed to a protein of 57,000 daltons, was developed from the fusion of mouse myeloma cells and the spleen cells of mice injected with cytoskeletal extracts of fibroblasts that have been aged in in vitro culturing conditions according to a schedule of serial passaging (Cristofalo VJ, Charpentier R: J Tissue Culture Meth 6:117, 1981; Wang E: J Cell Biol, submitted). The staining activity of S-30 antibody was observed exclusively in the nuclei of nonproliferating senescent fibroblasts, but not in their young counterparts. Immunolocalization of S-30 antibody in frozen tissues from various sites reveals the positive staining reaction in the nuclear envelope region in those cells that are at the final stage of differentiation and are no longer replicating. These tissue sites include epithelial cells of the suprabasal layer of epidermis, hair sheath, and tongue, a subpopulation of fibroblasts in the dermis, chondrocytes, hepatocytes, and cells of cardiac muscle. The absence of S-30 staining activity was noted in tissues such as simple epithelium located in the gastrointestinal tract and kidney, and keratinocytes in the basal layer. These results suggest that the S-30 antibody can be used as a marker for nonproliferating cells both in cultured fibroblasts and in some tissues. It seems that the mechanism that controls the cessation of cell proliferation is related, in part, to the postmitotic expression of the 57,000 dalton protein.

Volume 33, Issue 6, pp. 587-594, 06/01/1985
Copyright © 1985 by The Histochemical Society


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